LG NP8540 Service Manual page 26

IF NOT BOOTING WHEN YOU TURN ON THE SET. AND LED DOESN'T TURN ON.
1-2. IC904 (NO 3.6 VA)
1-2-1. Solution
Replace IC904 on main board.
1-2-2. How to troubleshoot (Countermeasure)
1) Please check 5.2 VA of IC904 Pin3(INPUT).
2) If 5.2 VA is abnormal, follow the stage 1-1 at the previous page.
3) If 5.2 VA is OK, but 3.6 VA is abnormal at the IC904(VOUT Pin4) replace IC904.
4) When you followed above step but It doesn't work, check the around parts. (R927, R928, L907)
1-2-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
IC904 IC904
< Main board top view >
3-3